Spring-fan



A. LIND.

SPRING FAN. APPLICATIONFILED SEPT.2I|1918.

'1 ,328, 172. Patented J an. 13, 1920.

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SPRING EAN.

APPLICATIO N FILED S EP T.21.1918. 1,328,172. l Patented. Jl1.l3,1920'.5

` vwentoz @HMM ma the ears 37 and is provided point spaced from its end with an enlarged portion 39 bearing against the outer-side of one ear. The extremity of the rod 33 is threaded as shown at 40 for engagement within the correspondingly threaded aperture in the other ear. At its other end, the rod 38 carries'a small beveled gear 41 which meshes with a beveled gear 42 formed on one end of a sleeve 43 rotatably mounted upon the stem 12 within the sleeve 19. At its outer end, the sleeve 43 is provided with teeth 44 for a purpose to be described. Y

i In .order that the band 36 may be held in proper concentric relation to the rotary disk 26, I providea plurality of screws 45 which are threaded through the sides of the housing 25 and which bear against the outer periphery of the band 36.

In connection with my device =I make use of a key formed Aas a cylindrical body 46 provided at one end with a square socket 47 engageable upon the squared extremity 13' of the post 12 and having its other end provided with a series of teeth 4S engageable with the teeth 44 formed on the outer end of the sleeve 46. j p

The operation of the device is as follows. In order to wind the spring 11, the operator places the key 46 upon the stem 12 with its squared socket 47 engaging the squared eX- tremity 13 of the stem. By rotating the key 46 the stem 12 will be rotated and the spring will be consequently wound. The unwinding action of the spring 11 will cause the ring gear 14 to be rotated, setting in motion the gear l5 and train of gears 16 which will result in rotation of the gear 17 and consequently the gear 18, sleeve 19 and fan 20. At the same time, the gear 17 drives the gears 29 and 28 and consequently rotates the disk member 26. During the rotation of the disk member 26 the arms 31 will swing outwardly under the influence of centrifugal force, whereupon the cam surfaces -33 thereon will press the free ends of the shoe members 34 outwardly into engagement `with the band 36. If the disk member 26 rotates faster than a certain predetermined rate the outward swinging movement of the arms 31 will cause the free ends of the shoe members 34 to bear against the direction will result in corresponding movetoward or from each other as the case may be. l/Vhen the sleeve 43 is rotated in the direction which will result in moving the ears 37 toward each other, the braking action of the band 36 will occur at a lower speed of the disk member 26. Vhen the ears 37 are similarly moved farther apart, the braking action of the band 36 will not occur until the disk member 26 attains a higher speed. In this manner the speed of rotation of the fan 2O may be readily controlled. i

From the foregoing description and a study of the drawing it will be apparent that I have thus provided a spring driven rotary fan which will be efficient in use and in which the speed of rotation may beV quickly and easily controlled entirely from the outside of the casing kwithin which the mechanism is disposed.

Vhile I have shown and described the preferred embodiment of the invention, it

will of course be readily understood that I- reserve the right to make such Vchanges in the form, construction and arrangement of parts as will not depart from the spirit of the'invention nor the scope of the subjoined claims.

Having thus described my invention I claim 1. In a gear driven rotary fan, a rotary disk having operative connection with the drive gears, a pair of weighted arms pivoted upon said disk and provided adjacent their inner ends with cam surfaces, a pair of spring shoes secured upon said disk at one end and having their other ends engaged by saidrcam surfaces, a split spring band disposed in concentric relation to said disk in position for engagement by said shoes, means for centering said ring with respect to the disk, and means for varying the diameter of said band. j

2. In a rotary fan, speed controlling mechanism comprisinga disk driven by the driving mechanism of the fan, Aa pair of weighted arms pivoted upon said disk and provided adjacent their inner ends with cam surfaces, a pair of spring shoes secured at one end upon said disk and having their other ends engaging said cam surfaces, a housing surrounding said disk, a split spring band disposed within said housing in concentric relation to said disk, means for contracting or expanding said split band, and a plurality of adjusting screws extending through said housing and engaging the outer periphery of said band whereby said band may vbe centered with respect to said disk.

3. In a rotary fan, including a hollow driven shaft, afan secured upon said shaft and meansfor rotating said shaft, a speed controlling mechanism comprising a disk having operative connection with said drive means, a pair of weighted arms pivoted upon said ,disk and having their inner ends provided With cam surfaces, a pair of Shoe members upon said disk and engaging said cam surfaces, a split spring band disposed in concentric relation to said disk and in position to be engaged by said shoe members, ears on the ends of said split band, an adjusting rod having one end in threaded engagement with said ears, a bevel gear on the other end of said rod, a sleeve disposed Within said hollow shaft and provided at 10 its inner end With teeth meshing With said bevel gear, and means for rotating said sleeve.

In testimony WhereofI aiiiX my signature.

ANNA LIND. 

